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From: "mstensho at opera dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug c++/15717] New: Printing style()-><whatever method AFAICT>()
 when running Chromium/Blink freezes
Date: Wed, 03 Jul 2013 10:41:00 -0000
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X-Bugzilla-Product: gdb
X-Bugzilla-Component: c++
X-Bugzilla-Version: 7.6
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: mstensho at opera dot com
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X-Bugzilla-Priority: P2
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http://sourceware.org/bugzilla/show_bug.cgi?id=15717

            Bug ID: 15717
           Summary: Printing style()-><whatever method AFAICT>() when
                    running Chromium/Blink freezes
           Product: gdb
           Version: 7.6
            Status: NEW
          Severity: normal
          Priority: P2
         Component: c++
          Assignee: unassigned at sourceware dot org
          Reporter: mstensho at opera dot com

When I build the content_shell executable that is part of the Chromium browser
[1] and set a breakpoint in e.g. RenderBlock::paint() (in
third_party/WebKit/Source/core/rendering/RenderBlock.cpp) and attempt to print
style()->display(), gdb 7.6 just freezes. I waited several minutes. This is
something that used to work.

I built content_shell like this, FWIW:
GYP_PARALLEL=1 GYP_GENERATORS=ninja build/gyp_chromium
ninja -C out/Debug content_shell

I start content_shell from gdb like this:
r --single-process
(otherwise it will be impossible to set breakpoints at all)

I initially discovered this with Debian jessie, which uses a provides a
(somewhat modified, I suppose) gdb 7.6 package, but the problem persisted when
I compiled my own vanilla gdb 7.6 and tried there.

I then downgraded to Debian wheezy (current stable), which has gdb 7.4, removed
my self-built gdb 7.6, and the problem went away again (without rebuilding
content_shell). Then I tried again with my self-built gdb 7.6, and the freeze
was back.

What I'm trying to say is that this doesn't appear to be a Debian-only problem,
and also that it actually appears to be a gdb problem.

[1] http://dev.chromium.org/developers/how-tos/get-the-code

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